Deep Cleaning

[Brucebigsur]

Hi there, I have a Roland HP 1700 that is full of dust and grime beneath the keys. I can see it from a side view. I'd like to be able to remove the keys as one big set and clean underneath as well as clean the contacts. There is a group of about 6 keys that produce no sound and one other key that produces an unusually loud sound. I have the unit open but I don't know how to proceed.